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Cu-doped TiO₂/graphene (Cu–TiO₂/GR) composites were successfully synthesized by a simple hydrothermal method. The coating of anatase TiO₂ nanoparticles on the whole graphene was confirmed by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). UV–visible diffuse reflectance spectroscopy (DRS) showed that the resulting Cu–TiO₂/GR composites exhibited extended light absorption in visible-light region compared with pure TiO₂. Photoluminescence emission spectra of Cu–TiO₂/GR composites showed better charge separation capability as compared to Cu/TiO₂ and pure TiO₂. The photocatalytic activity was evaluated by degradation of methyl orange (MO) dye under visible-light irradiation. The results demonstrate that Cu–TiO₂/GR composite can effectively photodegrade MO, and show an excellent photocatalytic enhancement over pure TiO₂. It …